1. The material of FOSC body: Ageing resistance & ultraviolet radiation resistance2. Base-to-dome seals on FOSC are mechanical and heat-shrinkable for ease of installation and reentry.3. Compatible with most cable types(single fiber or ribbon), and cable constructions(loose tube, central core, slotted core, modular). And the product can be used in any environment (aerial, buried, handhole, manhole)and in many applications(tap-off, expressed, branch, and repair)4. No special tools are needed to open the closure, and it can be opened and used repeatedly.5. Small holes +1 oval hole6. Small holes(dia. 2cm) +1 oval hole7. Small holes(dia. 2cm) +1 oval hole